You can pay to be upgraded to a business class seat.你可以付费升级到商务舱。Helicopters have been upgraded and modernized.直升机已经更新换代，装配了现代化设备。They upgraded the land by improving it with new buildings.他们建造新楼房来提高土地的等级....
Medical facilities are being reorganized and upgraded.正在对医疗设施进行重组和升级。She sent her provisional licence with the test certificate to have it upgraded to a full licence.她将临时执照连同考试证书一起提交上去以申请升级为正式执照。You can pay to be upgrade...
A knot sometimes forms in a tired muscle.疲乏的肌肉上有时会起硬块。A knot of people stood talking outside the door.一群人站在门外聊天。Slack the rope before trying to untie the knot.解结之前先将绳索放松.Root - knot nematodes, Meloidogyne species , are a...
Relax and take a breather whenever you feel that you need one.要放松，什么时候觉得需要休息就休息一下。Let's take a breather before we go on.喘口气再干.The fresh - air inlet was usually the crankcase breather cap.新鲜空气进口一般是曲轴箱通气盖....
在许多细胞中,含量最高的磷脂是磷脂酰乙醇胺或脑磷脂.The most abundant phospholipid in many cells is phosphatidyl ethanolamine or cephalin.乙醇胺在气体的纯化和分离方面也是有用的.Ethanolamines are also of value in the purification and the separation of gases.利用不经提纯的棉...